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TI-30XA (2013): retained the size and shape of the 1996 model, having buttons rounded on the bottom, and the color of the "2nd" button changed from yellow to green. With introduction of a new circuit board in 2015 the logarithm bug was fixed, [ 4 ] also the calculator switched to using just one 1.5V battery instead of two.
The SR-51 had the same physical dimensions but added a 2nd function for most buttons. Most notable among the added functions were the ability to enter x:y pairs and do linear regression analysis on them. The later and lighter versions SR-50A and SR-51II and SR-51III were based on smaller ICs and battery packs and reached broadest distribution.
Replacement battery packs are no longer available, leaving existing HP-35 calculators to rely on AC power, or their users to rebuild the battery packs themselves using available cells. An external battery charger was available, and the calculator could also run from the charger, with or without batteries installed.
Cost and thermal issues limit how much power the rectifier can handle, so beyond approximately 240 V AC and 75 A it is better for an external charging station to deliver DC directly to the battery. For faster charging, dedicated DC chargers can be built in permanent locations and provided with high-current connections to the grid.
Mercury battery "РЦ-53М"(RTs-53M), Russian manufactured in 1989. A mercury battery (also called mercuric oxide battery, mercury cell, button cell, or Ruben-Mallory [1]) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte.
Perhaps the HP-42S was to be released as a replacement for the aging HP-41 series as it is designed to be compatible with all programs written for the HP-41. Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement.
HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $4,912 in 2023) [ 2 ] , it featured nine storage registers and room for 100 ...
In May 2023, a HP 15C Collector's Edition was announced [8] and was released in July 2023 by the HP Development Company, L.P.'s licensees Moravia Consulting spol. s r.o. and Royal Consumer Information Products, Inc. [9] [10] The calculator is manufactured in the Philippines. It supports up to 672 steps for programs and up to 99 registers.